JWT tokenize - Postman Pre-Request Script

pre-request-jwt.js

var header = {
	alg: "HS256",
	typ: "JWT"
};

var data = injectIAT({
	userId: "<userID>",
	username: "<user>",
	email: "<email>",
	displayName: "<displayName>",
	profileName: "<profileName>",
	exp: Math.round(Date.now() / 1000) + 300
});

var secret = '<jwtSecret>';

var encodedHeader = base64url(CryptoJS.enc.Utf8.parse(JSON.stringify(header)));
var encodedData = base64url(CryptoJS.enc.Utf8.parse(JSON.stringify(data)));
var token = `${encodedHeader}.${encodedData}`;
var signature = base64url(CryptoJS.HmacSHA256(token, secret));
var signedToken = `${token}.${signature}`;

postman.setEnvironmentVariable('jwtToken', signedToken);

function base64url(source) {
	return CryptoJS.enc.Base64
		.stringify(source)
		.replace(/(\+|\/)/g, '-')
		.replace(/=+$/, '');
}

function injectIAT(dataPayload) {
	return Object.assign(
	    dataPayload,
	    { iat: Math.floor(Date.now() / 1000) }
	);
}